This was a targeted deal that was posted on Cheapies before. However, this deal seems to be available to all exisiting contact energy users now.
Apply to existing contact energy customers only: Simply join Contact mobile using the same name and email address that you use for your energy account. Have your energy account number handy as you'll need to enter that too (you can find this on your last bill). We'll add your $300 credit to your energy account within 7 days.
*Promotion is for a limited time and only available to new Contact mobile customers and only for existing Contact energy customers. Contact reserves the right to cancel, modify or suspend this promotion at any time and shall not be liable for any loss or damage incurred as a result. The credit is not transferable, refundable or redeemable for cash or cash equivalents. The three months free offer excludes add-ons, international charges, roaming, MMS and premium numbers.
So you can join mobile for 3 months, get it free, then leave, and still get $300 of credit?